CAS is pleased to announce

Our Upcoming Events
For 2017


Join us for the Chicago National Sports Collectors Convention
July 26th - July 30th, 2017

Wednesday, July 26 - 4PM to 8PM (sneak peek) Thursday, July 27 - 10AM to 6PM Friday, July 28 - 10AM to 6PM Saturday, July 29 - 10AM to 6PM Sunday, July 30 - 10AM to 5PM

Donald E. Stephens Convention Center - 5555 N. River Rd, Rosemont, IL
  • Our Services

  • About Us

  • Verify Your Item

Services ofCertified Authentication Service

  • Primary Certifications

    This service is used for most items valued under $300 and includes a 2 ½” x 2 ½” certification card with a matching tamper proof sticker on your item

  • Item Submission

    Have items to submit to CAS for authentication? You can ship your items to us, visit our office, catch us at a show, and we even make house calls!

  • One-Step Verification

    You authenticated item will have a unique alphanumeric sticker that matches your certificate. Click below to verify your item with our database...


Client TestimonialsWhat Our Clients Are Saying

  • "Over the past 5 yrs using Mike Root as an authenticator I found him to be 100 percent Honest, fair and accurate with his services. 
    He has always been very responsive and price-conscious to my needs
    as a customer.
    Thank you Mike for coming back!"

    Jack Probstein
    read more
  • "We have known Mike for many years and relied on his expertise & integrity in authenticating autographs of both vintage and current day athletes as well as celebrities. We have used LOA's and COA's provided by Mr. Root in our auctions & sales and have never had a problem with his work."

    Lou & John
    Inside the Park Collectibles
    read more